Slidable side jaw wrench



May 31, 1955 P. e. BRYNGE 2,709,387

SLIDABLE SIDE JAW WRENCH I Filed July 1, 1955 4 Sheets-Sheet 1 INVENTOR.

PER GUNNAR BRYNGE Mxaw ATTORNEY May 31, 1955 P. G. BRYNGE 2,709,387 SLIDABLE SIDE JAW WRENCH Filed July 1, 1953 4 Sheets-Sheet 2 1N VEN TOR. PER GUNNAR BRYNGE BY 40454 Q.

ATTORNNEY May 31, 1955 P. a. BRYNGE SLIDABLE SIDE JAW WRENCH 4 Sheets-Sheet 3 Filed July 1, 1953 [N V EN TOR. PER GUNNAR BRYNGE BY 7 Mi 9. a

ATTORNEY May 31, 1955 P. e. BRYNGE SLIDABLE SIDE JAW WRENCH 4 Sheets-Sheet 4 Filed July 1953 INVENTOR, PER GUNNAR BRYNGE BY ATTORNEY United States Patent SLIDABLE SIDE JAW WRENCH Per Gunnar Brynge, Fannalund, Enkoping, Sweden Application July 1, 1953, Serial No. 365,452 Claims priority, application Sweden June 8, 1953 6 Claims. (C1. 81-16S)' The present invention relates to a bearing arrangement for the adjustment screw of wrenches, in which the adjustment screw is turnably mounted on a rigid pin, and the object of the invention is to secure without too much precision at the manufacture as little play as possible between the adjustment screw and the toothed rod formed on the adjustable jaw.

According to the invention this is effected thereby that the pin at one or both ends is displaceably mounted towards the movable jaw and that the displaceable end or ends of the pin are actuated by members acting resiliently right angularly or substantially right to said pin, said members tending to hold the adjustment screw in engagement with the teeth of the movable jaw with as little play as possible.

In the accompanying drawing several embodiments of the invention are shown by way of illustration and not by way of limitation.

In the drawing:

Fig. 1 is an isometric view, partly in section, of a slidable side jaw wrench according to the invention.

Fig. 2 is a view similar to Fig. 1 showing a modification of the wrench.

Fig. 3 is an exploded view of the component parts of another modification of the wrench, and

Fig. 4 is a view similar to Fig. 1 and showing still another modification of the wrench.

In Fig. 1 the reference numeral 1 designates the head of the wrench with the stationary jaw 2. The reference numeral 3 designates the movable jaw which is displaceably mounted in a groove 4 in the head of the wrench and is formed at the underside of the guiding part 5 running in the groove, with teeth 6, which cooperate with an adjustment screw 9 mounted on a rigid pin 8 and inserted in an opening 7 in the head of the wrench.

Hitherto the shaft pin was usually inserted tightly in a bore in the head of the wrench, and in case this bore was not exact, the adjustment screw mounted on the shaft pin was not always in a firm engagement with the teeth 6 of the movable jaw 3 and with the tops of the teeth reaching the bottom of the grooves between the thread ridiges of the adjustment screw 9.

By mounting the shaft pin 8 in such a manner that one or both ends by the action of a spring can be displaced towards the movable jaw 3, it is possible to obtain a certain degree of self-adjustment of the adjustment screw 9, so that it always engages the guide part 5 of the movable jaw 3 in the manner desired.

In Fig. 1 the ends 11 and 12 of the pin 8 are bailshaped, while the pin between the ends is in the form of a cylinder 13, the diameter of which corresponds to the axial, central bore of the adjustment screw 9.

Between the cylindrical part 13 and the ball-shaped ends 11, 12 the diameter of the journal is preferably smaller, possible narrowing towards the ends.

One end 11 of the pin 8 rests in the outer end of a bore 14 provided in one end portion of the head of the wrench, said bore continuing some distance at the other 2,709,387 Patented May 31, 1955 side of the opening 7 provided in the head of the wrench for the insertion of the adjustment screw 9, where it is right angularly or approximately right angularly crossed by a bore 16 provided in the head of the wrench, in which bore the other ball-shaped end 12 of the pin 8 protrudes. In this bore 16 a screw spring 17 is introduced which presses against the ball-shaped end 12 of the pin, so that the said pin 8 is forced to swing around the end 11, until the teeth 6 of the movable jaw 3 with their ridges reach the bottom of the grooves between the thread ridges of the adjustment screw, as shown in Fig. 1. In one end of the adjustment screw 9 the central bore 10 is somewhat widened, and in this widened portion a screw spring 18 is inserted which tends to press the adjustment screw 9 towards one side wall of the opening 7 in a well-known manner.

In Fig. 2 approximately the same embodiment as in Fig. 1 is shown, except that the screw spring 17 presses against the end 12 of the pin 8 through the agency of a bearing cup 19 carried by the spring.

In Fig. 3 which shows a wrench taken apart, the two ends 11, 12 of the pin 8 are supposed to be mounted in the same manner in bores 16 containing screw springs 17. The pin then may automatically be given a parallel displacement in order to secure the desired firm engagement between the adjustment screw 9 and the teeth 6 of the movable jaw 3.

In order to retain the pin 8 in position in the head 1 of the wrench a plug 20 screwed into the bore 14 may be used, which plug with an inwardly directed groove 21 engages a corresponding flange 22 protuding from the end 11 of the pin 8. This flange when the groove is parallel with the axis of the bore 16, allows the end 11 of the pin 8 to be displaced in the bore 16 by the screw spring 17 applied in said bore.

In Fig. 4 an embodiment is shown which substantially corresponds to the wrench shown in Fig. 1, except that the adjustment screw 9 in the last embodiment is mounted on a ball-shaped portion 23 formed centrally on the pin 8.

Having now particularly described the nature of my invention and the manner of its operation what I clan 1s:

1. A wrench comprising in combination, a head having a fixed jaw and a guideway, a shank slidable in said guideway and having on one end a movable jaw coacting with the fixed jaw and at the opposite end a gear rack, said head further including a first bore extending along said gear rack and a second bore extending perpendicularly to the first bore and issuing into the same at one end thereof, a bearing pin disposed within said first bore, one end of said pin abutting against the other end of said first bore, an adjusting worm rotatably fitted upon said pin in mesh with said rack for adjusting said movable jaw, said abutting pin end forming a fulcrum for the pin and with it for the worm, the other end of said pin overhanging said second bore, and a loaded spring fitted in said second bore and engaging said overhanging pin end so as to bias the worm into tight engagement with the teeth of said rack and to prevent axial displacement of the pin and with it of the worm.

2. A wrench comprising in combination, a head having a fixed jaw and a guideway, a shank slidable in said guideway and having on one end a movable jaw coacting with the fixed jaw and at the opposite end a gear rack, said head further including a first bore extending along said gear rack and a second bore extending perpendicularly to the first bore and issuing into the same at one end thereof, a bearing pin disposed within said first bore, one end of said pin abutting against the other end of said first bore, an adjusting worm rotatably fitted upon said pin in mesh with said rack for adjusting said movable jaw, said abutting pin end forming a fulcrum for the pin and with it for the worm, the other end of said pin being formed with a ball, and a loaded spring fitted in said second bore abutting with one end against the base of said second bore, the other end of said spring seating said ball so as to bias the worm into engagementwith the teeth of the rack and to prevent axial displacement of the pin and Within it of the worm.

3. A Wrench according to claim 2, wherein the said fulcrum forming pin end is also ball-shaped, the end of the first bore receiving the respective pin end being axially extended beyond said gear rack.

4. A wrench according to claim 2, wherein a bearing cup is interposed between said spring and the respective ballshaped end of the pin.

5. A wrench according to claim 1, wherein the said pin includes a cylindrical intermediate portion, the said worm being seated upon the said intermediate portion.

6. A wrench according to claim 1, wherein the said pin includes a ball-shaped intermediate portion, the said worm being seated upon said intermediate portion.

References Gite-d in the file of this patent UNITED STATES PATENTS 965,890 Greenwood Aug. 2, 1910 1,469,533 Rahling Oct. 2, 1923 1,501,903 Gordon July 22, 1924 1,747,360 Giles Feb. 18, 1930 2,499,644 Heyn Mar. 7, 1950 FOREIGN PATENTS 352,961 France Aug. 30, 1905 312,171 Germany May 16, 1919 698,313 France Nov. 18, 1930 

